The 'Smeller' by designer Hee Tae Yang works as an artificial nose to analyze your food and help you avoid rotten produce. All you have to do is hold up your food to the Smeller and click a button. The gadget then takes a whiff of your object and compares the chemical composition to a database of scents. After a few moments, the Smeller is able to tell you whether or not the food is safe to eat. The device rates your food as either 'Very fresh,' 'Fresh,' 'A bit rotten,' and 'Rotten.'
Yang's device works by using an electronic nose to detect scents. After you press a button, the device places your food's scent into a storage compartment. A touchscreen display on the top of the Smeller then lets you know the status of your food.